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Montana Tunnels/Diamond Hill

Plant in Jefferson county in Montana, United States with commodities Gold, Lead, Silver, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Economic information about the deposit and operations
  15. Mining district
  16. Mineral rights holdings
  17. Land status
  18. Ownership information
  19. Production statistics
  20. Reserves and resources
  21. Workings at the site
  22. Links to other databases
  23. Bibliographic references
  24. General comments
  25. Reporter information

Geologic information

Identification information

Deposit ID 10124812
MRDS ID DB02213
MAS/MILS ID 0300430247
Record type Site
Current site name Montana Tunnels/Diamond Hill
Alternate or previous names Montana Tunnels Project, Montana Tunnels

Geographic coordinates

Point of reference Pit
Geographic coordinates: -112.13418, 46.3721 (WGS84)
Elevation 1700
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Jefferson(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Thompson(quadrangle 1:24,000 scale)

Butte North(quadrangle 1:100,000 scale)

Butte(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Missouri(hydrologic unit)

Upper Missouri(hydrologic accounting unit)

Missouri-Marias(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Montana Jefferson

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 007 N 004 W 08 C Montana

Commodities

Commodity Importance
Gold Primary
Lead Primary
Silver Primary
Zinc Critical Primary

Comments on the commodity information

  • SULFIDE MINERALS OCCUR AS DISSEMINATIONS IN THE BRECCIA MATRIX AND, TO A LESSER EXTENT, AS WIDELY SPACED MULTIDIRECTIONAL VEINLETS AND AS MATRIX TO BRECCIATED BLOCKS OF ELKHORN MOUNTAIN VOLCANICS. AU OCCURS IN ELECTRUM, WITH A FINENESS OF APPROXIMATELY 550 AND AS INCLUSIONS OF <200 MICRONS IN PYRITE AND SPHALERITE. AG IS PRESENT MAINLY IN SOLID SOLUTION IN GALENA. AU-AG MINERALIZATION DECREASES SIGNIFICANTLY AT AN APPROXIMATE DEPTH OF 1000 FT., WHILE PB AND ZN VALUES CONTINUE TO A DEPTH OF AT LEAST 2000 FT. MN VALUES ARE HIGH WHILE HG, AS, AND SB VALUES ARE LOW COMPARED TO MANY VOLCANIC-HOSTED PRECIOUS METAL DEPOSITS.

Materials information

Materials Type of material
Chalcopyrite Ore
Electrum Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Proustite Ore
Pyrargyrite Ore

Alteration

  • (Local) PERVASIVE SERICITIC

Mineral occurrence model information

Model code 84
USGS model code 22b
Deposit model name Alkaline Au-Te (Au-Ag-Te veins)
Mark3 model number 80

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock type qualifier ANDESITIC VOLCANICLASTIC ROCKS
    Rock unit name ELKHORN MOUNTAINS VOLCANICS
    Stratigraphic age (youngest) Cretaceous
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock type qualifier QUARTZ LATITIC IGNIMBRITES
    Rock unit name LOWLAND CREEK VOLCANICS
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granodiorite
    Rock type qualifier GRANODIORITE; QUARTZ LATITE PORPHYRY DIKES (LCV)
    Rock unit name BOULDER BATHOLITH; LOWLAND CREEK VOLCANICS
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

Pit (1) -112.13418, 46.3721
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure name LARGE ROOF PENDANT
Type of structure Local
Structure name FAULT CONTACT

Ore body information

  • General form PIPE-LIKE
    Plunge VERTICAL
    Length 304.8M
    Width 243.84M
    Depth to bottom 609.6M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 PIPELIKE
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 POTASSIC
    Date of Last Modification 870205
  • Area 391HA
    Field Value
    Total Surface Area (HA) 391
    Date of Last Modification 910418

Comments on the geologic information

  • OREBODY IS CONTAINED WITHIN DIATREME PIPE.
  • DEPOSIT IS IN CENTRAL PART OF A DIATREME BRECCIA THAT WAS EMPLACED ALONG THE FAULTED CONTACT BETWEEN ANDESITIC VOLCANICS AND A SEQUENCE OF QUARTZ LATITIC IGNIMBRITES. PRINCIPAL ROCK TYPE IN THE DIATREME IS A MATRIX-RICH BRECCIA. ALTERATION IS SERICITIC IN NATURE.
  • THE DIATREME WHICH HOSTS MINERALIZATION WAS EMPLACED ALONG THE FAULTED CONTACT BETWEEN ANDESITIC VOLCANICLASTIC ROCKS, ASSIGNED TO THE LATE CRETACEOUS ELKHORN MOUNTAINS VOLCANICS, AND A SEQUENCE OF QUARTZ LATITIC IGNIMBRITES, WHICH ARE PART OF THE LOWLAND CREEK VOLCANICS OF MIDDLE EOCENE AGE.
  • FAULT CONTACT BETWEEN THE MIDDLE EOCENE LOWLAND CREEK VOLCANICS AND THE LATE CRETACEOUS ELKHORN MOUNTAINS VOLCANICS. THE DIATREME IS SEPARATED INTO TWO UNEQUAL PARTS BY A WEST-NORTHWEST-STRIKING OBLIQUE SLIP FAULT. IT HAS A MAXIMUM SINISTRAL OFFSET OF ABOUT 180 M (SILLITOE AND OTHERS, 1985). THE DIATREME APPEARS TO CUT, AND IS THOUGHT TO HAVE BEEN LOCALIZED BY, A GRABEN FAULT THAT DELIMITS THE WESTERN EDGE OF THE LOWLAND CREEK VOLCANICS (SILLITOE AND OTHERS, 1985). ALSO, MINOR FAULTS, MARKED BY UP TO 1 CM OF DARK GRAY GOUGE, ARE WIDESPREAD IN THE DIATREME BRECCIA AND AT LEAST SOME OF THEM APPEAR TO BE PRODUCTS OF DIFFERENTIAL SUBSIDENCE WITHIN THE DIATREME RATHER THAN RESPONSES TO REGIONAL TECTONISM. (SILLITOE AND OTHERS, 1985).
  • THE PRINCIPAL ROCK TYPE OF THE DIATREME IS A MATRIX-RICH BRECCIA. CLASTIC GRAINS OF THE SULFIDES AND GANGUE MINERALS ARE COMMON AND ATTEST TO MULTIPLE ALTERNATING EPISODES OF BRECCIATION AND MINERALIZATION. 70 TO 90% OF THE ORE AND GANGUE MINERALS OCCUR AS DISSEMINATIONS AND THE REMAINER IN CROSSCUTTING VEINLETS. (SILLITOE AND OTHERS, 1985).

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Plant
Commodity type Metallic
Deposit size Medium
Significant Yes
Discovery year 1981
Mining method Open Pit
Year of first production 1987
Plant type Leach
Milling method Flotation

Comments on exploration

  • UNDERGROUND MINING BEGAN IN 1864 AND FLOURISHED UNTIL THE EARLY 1900'S. ; ECON.COM: AU RECOVERY AVERAGES 88%, AG RECOVERY AVERAGES 75%. UNIT COSTS WERE $8.61 PER TON IN LATE 1991. CASH COSTS PER OUNCE OF AU NET OF BYPRODUCT WERE $21 IN 1990 AND $121 IN 1991, THE INCREASE ATTRIBUTABLE TO SHARPLY LOWER ZN PRICES. MINING RATE WAS 12,500 ST/DAY IN 1988. MINE LIFE EXPECTED TO BE 12 YRS (OR 15 YRS. IF LOW GRADE ORE IS RECOVERED), BASED ON 1988 RESERVES. TOTAL MINESITE WORKFORCE, INCLUDING THE MINING CONTRACTOR, IS 174 PERSONNEL WITH AN ANNUAL PAYROLL OF APPROXIMATELY $7.5 MILLION. IN 1990 THE MINE PURCHASED OVER $7.7 MILLION WORTH OF GOODS AND SERVICES FROM THE LOCAL AREA AND PAID $1.6 MILLION IN PROPERTY AND MINING TAXES TO STATE, COUNTY, AND LOCAL GOVERNMENTS.

    1975-1983- AREA TARGET OF AT LEAST SIX EXPLORATION COMPANIES AND ALL DROPPED THE PROPERTY.

    1983-84- CENTENNIAL MINERALS LTD. (WITH USMX, THE OWNER OF THE PROPERTY) COMPLETED EXPLORATION PROGRAM. USMX IS THE US MINERALS EXPLORATION COMPANY.

    DECEMBER 1984-OPERATING PERMIT APPLICATION SUBMITTED TO MDSL.

    LATE 1985-DRAFT EIS COMPLETED.

    SEPTEMBER 1985-PEGASUS OFFERS TO ACQUIRE SHARES OF CENTENNIAL MINERALS LTD.

    NOVEMBER 1985-PEGASUS (THROUGH ITS SUBSIDIARY, CENTENNIAL MINERALS LTD) PROCEEDS WITH DEVELOPMENT

    FEBRUARY 1986-EIS FINALIZED; OPERATING PERMIT GRANTED

    MARCH, 1986-CONSTRUCTION STARTS

    1987-PEGASUS ACQUIRES 100% WORKING INTEREST FROM USMX

    MARCH 1987- MILL START-UP

    JANUARY 16,1998- PEGASUS GOLD INC. FILES FOR PROTECTION UNDER CHAPTER 11.

Mining district

District name Wickes

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights Fee Ownership
Type of mineral rights Private Lease

Land status

Ownership category Unknown

Ownership information

  • Type Owner
    Owner Pegasus Gold Inc.
    ID 2401769
    Interest 100
    Home office Washington
    Year 1996
  • Type Operator
    Owner Montana Tunnels Mining, Inc.
    Home office Montana
    Year 1996

Comments on the ownership information

  • USMX RECEIVES A 5% NSR OR $60,000 MIN TILL PAYBACK THAN 50% NSR AFTER PAYBACK.

Production statistics

  • Year 1991
    Description Silver Production 1166300 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 3293048g
  • Year 1991
    Description Gold Production 62600 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1767511g
  • Year 1992
    Description Silver Prodrction 1325700 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 3743113g
  • Year 1992
    Description Gold Production 74700 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2109154g
  • Year 1993
    Description Silver Production 1401100 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 3956005g
  • Year 1993
    Description Gold Production 68900 T Oa/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1945391g
  • Year 1994
    Description Silver Production 1085700 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 33769049.32g
  • Year 1994
    Description Gold Production 80200 T Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2264447g
  • Year 1995
    Description Silver Production 1073200 T Oz/Yr Silver
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 33380255.8g
  • Year 1995
    Description Gold Production 89200 T Oz/Yr Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2774430.5g
  • Year 1996
    Description Silver Production 921500 T Oz/Yr Silver
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 28661857.74g
  • Year 1996
    Description Gold Production (Includes Diamond Hill) 81600 T Oz/Tr Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2538044.04g

Comments on the production information

  • GOLD AND SILVER YIELDS ARE IN DORE OF UNKNOWN COMPOSITION. . ESTIMATED DORE ASSAY IS: 5.5 PERCENT GOLD AND 89.2 PERCENT SILVER. ASSUMING COMBINED GOLD/SILVER IS ABOUT 95 PERCENT. OF TOTAL COMBINED METALS IN DORE. .
  • 1988 AU PROD.= 106,000 OZ.; 1989 AU PROD.= 57,242 OZ. 1991-1996 PRODUCTION INCLUDES DIAMOND HILL:
  • PRODUCT RECORD A INCLUDES ALL MILL COSTS FOR ALL PRODUCTS. GOLD AND SILVER (PRODUCTS A AND B) ARE COMBINED AS DORE PRODUCT. BOTH ARE PRODUCTS OF LEACH PORTION OF CIRCUIT.
  • FROM 1987 TO 12/31/91: 18.5 MILLION TONS OF ORE ASSAYED 0.020 OPT AU, 0.46 OPT AG, 0.26% PB, AND 0.71% ZN.

    PRODUCTION NUMBERS FROM PEGASUS ANNUAL REPORTS AND MINE INFORMATION PACKETS:

    1988-73,971 OZ AU, 975,463 OZ AG, 8,250 TONS PB, 19,350 TONS ZN

    1991-62,600 OZ AU, 1,167,000 OZ AG, 7,200 TONS PB, 18,300 TONS ZN FROM 3,870,000 TONNES

    1992-74,700 OZ AU, 1,325,700 OZ AG, 7,200 TONS PB, 19,400 TONS ZN FROM 4,150,000 TONNES

    1993-68,900 OZ AU, 1,401,100 OZ AG, 7,000 TONS PB, 18,000 TONS ZN FROM 4,170,000 TONNES

    1994 - 80,200 OZ AU, 1,085,700 OZ AG, 9,400 TONS PB, 19,800 TONS ZN FROM 4,720,000 TONNES

    1995 - 89,200 OZ AU, 1,073,200 OZ AG, 7,400 TONS PB, 21,600 TONS ZN FROM 5,10,000 TONNES

    1996 - 73,000 OZ AU, 916,400 OZ AG, 7,000 TONS PB, 18,300 TONS ZN FROM 4,961,000 TONNES

    1997- 78,500 OZ AU, 785,400 OZ AG; 8,493 TONS PB; 20,861 TONS ZN; FROM 4,668,000 TONNES

    1998-70,000 OZ AU

    1999-75,000 OZ AU



    GOLD RESERVES AS OF DECEMBER 31, 1997 CALCULATED AT $350/OZ GOLD:

    PROVEN AND PROBABLE - 17,589,000 TONNES @ 0.55 GRAMS/TONNE WITH 308,000 CONTAINED OUNCES.

    MINERALIZED MATERIAL - 18,603,000 TONNES @ 0.57 GRAMS/TONNE WITH 343,000 CONTAINED OUNCES.

    ADDITIONAL MINERALIZATION - 14,043 TONNES @ 0.52 GRAMS/TONNE WITH 233,000 CONTAINED OUNCES.



    MILL USES CRUSHING, SEMI-AUTOGENOUS AND BALL MILL GRINDING, AND BULK FLOTATION TO PRODUCE A SULFIDE CONCENTRATE. THE CONCENTRATE IS REGROUND, FILTERED AND THE GOLD AND SILVER DISSOLVED DURING AN AGITATED CYANIDE LEACH. GOLD AND SILVER ARE RECOVERED IN THE MERRILL CROWE PROCESS WITH LEAD AND ZINC CONCENTRATES PRODUCED BY DIFFERENTIAL FLOTATION..

Reserves and resources

  • Type In-situ
    Estimate year 2002
    Total resources 123000000mt ore
  • Type In-situ
    Estimate year 1991
    Indicated 37648800mt ore
    Demonstrated 37648800mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 11.51 g/mt Gold Major 1991
    Lead Pb 0.23 wt-pct Lead Minor 1991
    Zinc Zn 0.63 wt-pct Zinc Minor 1991
  • Type In-situ
    Estimate year 1996
    Demonstrated 22185000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.58 g/mt Gold Major 1996
  • Type In-situ
    Estimate year 1997
    Demonstrated 17095000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.54 g/mt Gold Major 1997
    Silver Ag 10.63 g/mt Silver Major 1997
    Lead Pb 0.21 wt-pct Lead Minor 1997
    Zinc Zn 0.62 wt-pct Zinc Minor 1997
  • Type In-situ
    Estimate year 1997
    Inferred 37221000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.54 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1997
    Inferred 673000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 6.87 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1997
    Total resources 37894000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.65 g/mt Gold Major 1997

Comments on the reserve resource information

  • REFERENCES 134 & 135 HAVE RESERVE/RESOURCES DATA: HOWEVER DATA COULD NOT BE SUPPORTED BY AVAILABLE ANNUAL & FROM 10-K REPORT DATA.
  • TOTAL PROVEN + PROBABLE ORE; 12/31/96: NO MINERALIZED MATERIAL PRODUCTION BASED ON AVG OF 1992-1996 ORE MILLED:
  • GOLD ASSAY IS EQUIVALENT VALUE AND INCLUDES SILVER, ZINC, AND LEAD VALUES: M1C1 JAN. 1987 BOM DEMONSTRATED RESOURCE: 1,113,460 OZ GOLD, M1C2. MAT 2 COL 1 REPRESENTS MINABLE RESOURCE; MAT 2 COL 2 REPRESENTS THE TOTAL RESOURCE AVAILABLE.

Workings at the site

  • Type of workings Surface
    Area 66HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .77
    Avg. Overburden Thickness 0
    Primary Material Cover SAND, GRAVEL
    Percentage 5
    Secondary Material Cover HARD ROCKS
    Percentage 0
    Hardness of Ore SAND, GRAVEL
    Avg. Bench Height (meters) 18
    Max. Pit Slope (degrees) 45
    Capacity 1134
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 1531
    Unit Production Cost 4.28
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1986

Comments on the workings information

  • HISTORIC UNDERGROUND WORKINGS CONSISTED OF 2 CAVED ADITS CONNECTED BY A WINZE 35 FT. DEEP. THE OPEN PIT MINE MOVES AN AVERAGE OF 70,000 TONS PER DAY OF ORE AND WASTE. THE ORE IS TREATED BY CRUSHING, THEN AUTOGENOUS AND BALL MILL GRINDING FOLLOWED BY SEQUNTIAL PB-ZN FLOTATION. PB AND ZN CONCENTRATES, CONTAINING THE PRECIOUS METALS, ARE CLEANED IN FURTHER FLOTATION STEPS AND SHIPPED TO REFINERIES BY TRUCK AND/OR RAIL. THE PB CONCENTRATE IS DELIVERED TO ASARCO'S EAST HELENA SMELTER, 20 MILES FROM THE MINE. THE ZN CONCENTRATE IS TRUCKED TO THE COMPANY'S RAIL LOADING FACILITY IN HELENA, WHERE IT IS LOADED ON RAILCARS TO COMINCO'S TRAIL SMELTER IN BRITISH COLUMBIA OR TO THE DOWA SMELTER IN JAPAN. THE PRESENT OPERATION COVERS 817 ACRES WITHIN A "PERMITTED" ACREAGE OF 1500 ACRES. THE ENTIRE MINING AND MILLING OPERATION IS ON PRIVATE LAND; NO STATE OR FEDERAL LANDS ARE INVOLVED.

Comments on development

  • UNDERGROUND MINING BEGAN IN 1864 AND FLOURISHED UNTIL THE EARLY 1900'S. ; ECON.COM: AU RECOVERY AVERAGES 88%, AG RECOVERY AVERAGES 75%. UNIT COSTS WERE $8.61 PER TON IN LATE 1991. CASH COSTS PER OUNCE OF AU NET OF BYPRODUCT WERE $21 IN 1990 AND $121 IN 1991, THE INCREASE ATTRIBUTABLE TO SHARPLY LOWER ZN PRICES. MINING RATE WAS 12,500 ST/DAY IN 1988. MINE LIFE EXPECTED TO BE 12 YRS (OR 15 YRS. IF LOW GRADE ORE IS RECOVERED), BASED ON 1988 RESERVES. TOTAL MINESITE WORKFORCE, INCLUDING THE MINING CONTRACTOR, IS 174 PERSONNEL WITH AN ANNUAL PAYROLL OF APPROXIMATELY $7.5 MILLION. IN 1990 THE MINE PURCHASED OVER $7.7 MILLION WORTH OF GOODS AND SERVICES FROM THE LOCAL AREA AND PAID $1.6 MILLION IN PROPERTY AND MINING TAXES TO STATE, COUNTY, AND LOCAL GOVERNMENTS. ; MILL.CAP : 4 MILLION TONS/YEAR

Reference information

Bibliographic references

  • Production

    PEGASUS GOLD INC., 1995 FORM 10-K REPORT, P17.

  • Geology

    USGS PROFESSIONAL PAPER 428., P.81, PLATE 1.

  • Geology

    USGS BULLETIN 527, P. 116.

  • Production

    PEGASUS GOLD INC., 1996 FORM 10-K REPORT, P12.

  • Geology

    Sillitoe R H, Grauberger G L, Elliott J E 1985 - A diatreme-hosted Gold deposit at Montana tunnels, Montana: in Econ. Geol. v80 1707-1721

  • Reserve-Resource

    MAT 1 COL'S 1 & 2 FROM U.S.M.X. 1996 ANNUAL REPORT.

  • Reserve-Resource

    MONTANA BUREAU OF MINES AND GEOLOGY, BUL. #129, 1991.

  • Reserve-Resource

    PEGASUS GOLD INC., 1995 ANNUAL REPORT, PP. 6-7 & FORM 10-K REPORT, PP. 9, 17.

  • Reserve-Resource

    PEGASUS GOLD INC., 1996 ANNUAL REPORT, PP. 6-7 & FORM 10-K REPORT, PP. 12-13.

  • Deposit

    ENGINEERING AND MINING JOURNAL. MINING ACTIVITY DIGEST. MAY, 1986, P. 8.

  • Deposit

    MAY, 1986, P. 8.

  • Deposit

    MINING CHEMICALS HANDBOOK. MINERAL DRESSING NOTES NO. 26. AMERICAN CYANIMID COMPANY. 1986, 178 P.

  • Deposit

    26. AMERICAN CYANIMID COMPANY. 1986, 178 P.

  • Deposit

    MONTANA DEPARTMENT OF STATE LANDS. MONTANA TUNNELS PROJECT - DRAFT ENVIRONMENTAL IMPACT STATEMENT. HELENA, MT .NOV., 1985.

  • Deposit

    PROJECT - DRAFT ENVIRONMENTAL IMPACT STATEMENT. HELENA, MT .NOV., 1985.

  • Deposit

    NOV., 1985.

  • Deposit

    SILLITOE, R., GEOLOGY AND GEOCHEMISTRY OF THE MONTANA TUNNELS OREBODY, MONTANA: A DIATREME-HOSTED GOLD DEPOSIT. NORTHWEST MINING ASSOCIATION METALS AND MINERALS CONFERENCE. SPOKANE, WA., APRIL, 1985.

  • Deposit

    TUNNELS OREBODY, MONTANA: A DIATREME-HOSTED GOLD DEPOSIT. NORTHWEST MINING ASSOCIATION METALS AND MINERALS CONFERENCE. SPOKANE, WA., APRIL, 1985.

  • Deposit

    NORTHWEST MINING ASSOCIATION METALS AND MINERALS CONFERENCE. SPOKANE, WA., APRIL, 1985.

  • Deposit

    SPOKANE, WA., APRIL, 1985.

  • Deposit

    SILLITOE, R., GRAUBERGER, G AND ELLIOTT, J. A DIATREME HOSTED GOLD DEPOSIT AT MONTANA TUNNELS, MONTANA. ECONOMIC GEOLOGY MAGAZINE, VOL. 80, 1985, P. 1707-1721.

  • Deposit

    HOSTED GOLD DEPOSIT AT MONTANA TUNNELS, MONTANA. ECONOMIC GEOLOGY MAGAZINE, VOL. 80, 1985, P. 1707-1721.

  • Deposit

    GEOLOGY MAGAZINE, VOL. 80, 1985, P. 1707-1721.

  • Deposit

    SKILLINGS MINING REVIEW. USMX/PEGASUS GOLD INC.'S MONTANA TUNNELS PROJECT - OVERVIEW AND UPDATE. DEC. 6, 1986 P. 4.

  • Deposit

    SPOKESMAN REVIEW. PEGASUS GOLD AWARDS MILL PROJECT, CONTRACT. MAY 30, 1986.

  • Deposit

    U.S. MINERALS EXPLORATION COMPANY. ANNUAL REPORT. 1986,

  • Deposit

    WRIGHT ENGINEERS LTD. FEASIBILITY STUDY-MONTANA TUNNELS PROJECT. VANCOUVER, CANDADA. OCT., 1985.

  • Deposit

    WALLACE MINER. MONTANA TUNNELS TO USE HELENA SMELTER. DEC. 4, 1986, P.1.

  • Deposit

    U.S.M.X. 1986 ANNUAL REPORT.

  • Deposit

    PEGASUS GOLD INC., 1991 ANNUAL REPORT, P 4- 5, 9-10.

  • Deposit

    USMX, INC. NEWS RELEASE. "USMX, INC. IN AGREEMENT TO SELL INTEREST IN MONTANA TUNNELS MINE TO PEGASUS GOLD CORPORATION, 6/25/96.

  • Deposit

    THE MINING RECORD, VOL 107, #34, AUG., 21, 1996, P19.

  • Deposit

    THE MINING RECORD, VOL 107, #49, 12/04/96, PP. 8, 9.

  • Deposit

    RANDOL MINING DIRECTORY, 1996/97, U.S. MINES AND MINING COMPANIES, P220.

General comments

Subject category Comment text
Deposit DEPOSIT IS ALSO IN SECTIONS 5, 7, 8 AND 9 T7N, R4W.
Deposit SELECTION OF USGS MODEL TYPE BASED ON COMPARISON MADE TO CRIPPLE CREEK, COLORADO (SILLITOE ET AL, 1985). THE DEPOSIT IS A VERTICAL PIPE-LIKE STRUCTURE APPROXIMATELY 800 FT. BY 1000 FT. IN PLAN AND AT LEAST 2000 FT. IN DEPTH.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-OCT-97 Buckingham, David A. U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Current status (per MSHA)

StatusAbandoned since 04/01/2019
MSHA mine ID2401769
Mine name (MSHA)Montana Tunnels Mining Inc
Current operatorMontana Tunnels Mining Inc
Current controller (parent)Eastern Resources, Inc.
Mine typeSurface (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

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